Composite negative pole piece and solid-state battery

By designing the current collector layer, energy storage layer, and interface layer of the composite negative electrode, the problems of lithium dendrite growth and uneven porosity in lithium metal batteries were solved, realizing a three-dimensional porous structure with high porosity, and improving the cycle stability and safety of the battery.

CN121964512APending Publication Date: 2026-05-01GUANGNA MINGSHANG NEW ENERGY TECH (SUZHOU) CO LTD
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Patent Information

Application Number
CN202610096158.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-23
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

The uneven pore distribution in the three-dimensional porous structure of existing lithium metal batteries limits lithium dendrite growth, battery safety, and structural stability. Furthermore, the low porosity of traditional carbon material framework structures affects the energy storage performance of batteries.

Method used

The composite negative electrode design includes a current collector layer, an energy storage layer, and an interface layer. The energy storage layer forms a three-dimensional porous structure with a porosity greater than 80% through carbon materials, binders, and pore-forming agents. The interface layer optimizes ion introduction by using ion conductors and dielectric enhancement materials to achieve synergy of electronic conduction, ion conduction, and metal deposition, thus avoiding lithium dendrite growth.

Benefits of technology

It improves the cycle stability and safety of lithium metal batteries, reduces volume expansion and interface impedance during charging and discharging, and enhances the cycle performance and energy storage performance of the battery.

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Abstract

The invention discloses a composite negative pole piece and a solid-state battery, and relates to the technical field of new energy batteries. The composite negative pole piece comprises a current collector layer and at least one composite functional layer located on the side face of the current collector layer, the composite functional layer comprises an energy storage layer and an interface layer, the energy storage layer comprises a carbon material, a binding agent, a dispersing agent, an ionic conductor and a metal-philic activation point, and the interface layer comprises a binding agent, an ionic conductor and / or a dielectric reinforcing material. Wherein the carbon material and the binder of the energy storage layer form a three-dimensional porous structure of which the porosity is greater than 80% and the aperture is any one of 1-10 [mu] m through a pore-foaming agent. The pore diameter of the energy storage layer of the composite negative pole piece is uniform, so that metal ions can be deeply, uniformly and compactly deposited in the energy storage layer, and the ion conductor and / or the dielectric reinforcing material of the interface layer further optimizes the ion introduction efficiency of the interface of the electrode material.
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